Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da45891764282f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 00:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 84ed6af72b58ce1df12afd3da734ce94 SHA-1: 68c0993f459df94598b198fe7938792794301728 SHA-256: 92da45891764282f903613240d70b56524d9cd699d2f2c7868c1c3e5b9692099
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF document itself contains obfuscated content, suggesting an attempt to obscure its malicious nature. The primary goal appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medsplus.us/admin/images/file/wofaxaxapejozaxa.pdf In PDF document text
    • http://paulabenveniste.com/UserFiles/file/6617314652.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/446864b43512243f6e6533155491da97/69234524710.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/14613801151.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88520700723.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/samizusijimejarozore.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/knvnfs97k1mlj34ieco9v9d7s9/50671591292.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/82087915195.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109022143214670.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327cd31821---nevefo.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/56617172087.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/29501063934.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/32839935422.pdfIn PDF document text
    • https://activepymes.com/pub/file/88188997757.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/33915738029.pdfIn PDF document text
    • http://precisao.org/files/files/19623662896.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/207c7ada0c254ee8b032de9dc540cae3/setibawazilitidolu.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/xaruduromojekofevixe.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/numusafolukeza.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/jitanulipimovadizejarer.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/sizolisinibeduxi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/73813958028.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/zulevetadeke.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/91725962693.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/kosena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pes+2020+ristechyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10252 bytes
SHA-256: ea18e1cd8d4f3b20581289dbb93a5145b1eacbdb85d0f16cb4875ec0eb012d7f
font_01_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 18412 bytes
SHA-256: ae6aaaabc561d22135de98d6b2a3c513fbd62088e12816147575303fd1f1bcc6